Overseaming-machine.



J. M. MERHow.4

OVERSEAMING MACHINE.

APPLICATION FILED JUNE 21,1915.

1,21 7,977. Ptented Mar. 6, 1917. E. l.

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UNrrEn s'rArEs PAFENT oFFroE.

JOSEPH 1v1. MERROW, OF HARTFORD, ooNNECrroUT, AssrcrNon ro THE MEEEOW MACHINE COMPANY, OF HARTFORD, CONNECTICUT, `A CORPORATIONv OF CON- NECTICUT.

OVERSEAMING-MAOHI'NE.

Patenten/rar. c, i917.

Application ined :rune 21,1915. ser'iainofsaasa.

T0 all whom t may concern:

Be it known that I, JOSEPH M. MERROW, a citizen of the United States, residing in the city of Hartford, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Overseaming- Machines; and I do declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the figuresand numerals of reference thereon.

This invention relates to overseaming machines of that type wherein a reciprocatory needle cooperates with a looper or loopers in a manner to produce overedge stitches. Stitches of this general character form the basis of a great variety of fabric edge finish and the rapidity with which a finish may be produced is in many cases of the uttermost importance. In order that mechanisms for producing these finishes may attain and withstand the extremely high speeds so desirable, simplicity of construction in a marked degree is quite essential.v With this fact in mind the present invention has been conceived and developed, the vprimary object thereof being the provision ofl asimplified construction for looper mechanism employed in producing overedge stitches, special attention havingbeen `given tothe supportr of moving parts to insure smoothness of action throughout continuous operation thereof at high speeds.

'In a pending application filed December,

12, 1914, Serial Number 876,917 there Vis shown and describeda formof looper mechanism adapted for sewing machines of the Merrow type.- One of the loopers in the mechanism mentioned i' is pivotally mounted on a slide, whereby in addition to an oscillatory movement, said looper may be moved bodily in a right line. In contradistinction to this action thel corresponding looper of the present invention is vmounted for oscillatory vmovement upon a pivoted support whereby it may be reciprocated in a curved path instead of in a rectilinear one.

In the drawings accompanying and forming a part Of the present vspecification there is shown in detail one convenientform ofV embodiment of the invention, it is, however, tobe understood, that theimprovement set forth is not limitedl to the embodiment herein shown as it is in many respects susceptible of variation without 'departure'y from the i 'scope of the invention as defined by the appended claims.

vReferring to the drawings Figure l is a front elevation of a Merrow sewing machine withcertain parts broken away to better show the embodiment therein of mechanism comprising'the present invention. 'Y .'f

Fig. 2 is a-view ,of the inner face of a frame cap' 'showing looper Amechanism mounted thereon, andz Fig. 23 is an edge view of the frame cap and a part ofthe vlooper'mechanism shown in Fig. 2, there `being alsoy shown in this trations. As shown the needle 1 is mounted for oscillatory movement in the needle carrier 4 which 1is pivotally supported on the machine frame vto permit of its beingl actu ated in thecustomary manner that will soon be made apparent." 'v l I Within the machine frame' 5, are a pair of cam cylinders 6 and 7 ,secured respectively to shaftsS and 9. 4To the shaft 8 is secured the combinedV driving pulley and hand wheel 10., 'Intermeshing gears 11 and 12 are secured respectively to cam cylinders Gand 7, whereby rotation of driving shaft 8 will cause the cam cylinders to rotate in unison to effect, as will hereinafter appear, the operation of looper mechanism supported on the inner face Aof a removable frame cap' 13. Needle carrier 4f, above mentioned, is connected by a link 14 with an eccentric extension of the shaft 9 whereby when the latter rotates said carrier will be oscillated about its supporting pivot.

TheV looper mechanism as illustrated in the drawings includes a pair of co-active loopers each of which is also co-active with thefa'bric penetrating needle. One of the loopers isv shown with athread car"- cev rying eye while the other is shown with simply a thread engaging notch or throat. 1t will be understood that the form of the loopers in the respect just noted may be changed to fulfil different requirements as to the character of stitch to be produced.

One of the loopers, as 15, may be considered as including a pivoted carrier as 16, supported on the inner face of frame cap 13 by the pivot or stud 17. Projecting from looper 15', intermediate its free end and the pivot 17 is a stud 1S provided with an antifriction roller 19 adapted to engage a cam groove 20 in the juxtaposed cam cylinder 6.

Referring now to the other looper, designated by 21, it, together with its carrier 22, may be described as cruciform. The oppositely disposed arms extending from the central portion or mid arm 23 of said carrier are provided with studs 24 and 25 supporting respectively anti-friction rolls 26 and 27, adapted respectively to engage correlated grooves 28 and 29 in the respective cam cylinders 6 and 7. Pivoted at one end to an arm of. carrier 22 in alinement with one l of the studs 24C or 25, preferably the latter (as shown) is an arm 30 pivoted at its opposite end for swinging or oscillatory movement about a stud 31 secured in the frame cap 13. The several cam grooves mentioned are formed with definite relation therebetween and the cams and needle reciprocating means are intergeared and connected to operate in synchronism whereby the stitch forming elements will be caused to traverse their respective paths in proper timing to render co-action between the loopers and also between each of them and the needle.

The looper 15 oscillates about its stationary pivot in a path below the plane of the needle plate 2, said path intersecting the path traversed by the needle, while the looper 21 is oscillated about a movable pivot so that it traverses a path which intersects both the path of the other looper and the path of the needle, the points of intersection being respectively below the plane of the needle plate at one side thereof and above the needle plate.

Ample support is provided for looper 15 by the stud 17, the looper 21, however, and the oscillatory arm to `which it is pivoted preferably have associated therewith means to furnish additional support to that afforded by the stud 31. I provide novel means for effecting this supplemental support and as will hereinafter appear such means together with the loopers are attached wholly to the frame cap 13.

Means for attaching this frame cap to the machine frame may vary. Heretofore in l machines of similar construction sai-d V,frame cap has been fitted to its receiving opening in the machine frame and secured by screws at one edge only thereof. 1n the present case, to more effectively eliminate vibration, 1 prefer to dispose positive securing devices, as screws 32, at opposite sides of the cap so that all moving parts sustained by the cap will be located intermediate the points of attachment. Obviously the cap may be conveniently removed to permit inspection and adjustment of thelooper mechanism.

Referring to Figs. 2 and 3, the supplemental supporting means for looper 21 will now be described. Attention may first be directed to the fact that the arm 30, has at its extreme ends a bearing against the inner surface of the frame cap 13, whereby outward thrust thereagainst will be effectually resisted. bviously this resista-nce is also similarly effective for the pivoted arm of looper carrier 22. lnterposed between the oppositely extending arm of carrier 22 and the frame cap and between the central portion or mid arm 23 of said carrier and the frame cap are respectively the bearing blocks 33 and 311 fastened to said frame cap by suitable screws. Block 33 is recessed at 35 to accommodate arm 30. These blocks also resist outward thrust of the engaging parts, displacement of the carrier 22, therefore, in the direction indicated is effectively prevented by ample bearing contact at three advantageously disposed points. Displacement of said carrier in the opposite direction to that just referred to is prevented by a guide bar 36, having an opposing surface which affords a bearing for the central portion or mid arm 23 of carrier 22 practically throughout the length of said arm.

This opposing surface of guide bar 36 is spaced from the inner face of the frame cap by a spacing block 37, at one end of the bar, and by an angularly extended foot 38 and the block 34, at the other end of the bar. Securing said bar to the frame cap are the screws 39 and 40, the former being countersunk in said frame cap, extended through the block 37 and threaded into the bar, while the latter is countersunlr inthe offset or angularly extended portion of the bar, extended through the block 34 and threaded into the frame cap.

From the foregoing it will be evident that the guidingor supporting surfaces for the loopers are ample in extent, disposed in a highly effective arrangement, and vprovided by parts well adapted for manufac- V ture, adjustment, and maintenance.

There are shown in the drawings the usual tensions, guides and take-ups which being well understood need not be herein described in detail.

What 1 claim is 1. 1n a sewing machine, looper mecha.- nism including in combination, an oscillatory arm, a looper carried by and movable with respect to said arm, and a pair of cam cylinders rotating in unison and having cor# related cam grooves adapted to move said arm and looper in substantially parallel planes.

2. In a sewing machine, looper mechanism including in combination, a frame cap supported by and removable from the machine frame,'a pair of cams adjacent to said frame cap, an arm pivoted to the frame cap, alooper movably carried by the arm and operable by the pair of cams; and supporting means attached to the frame cap and having opposed surfaces in contact with said loo-per.

3. In a sewing machine, looper mechanism including in combination, a pair of cam cylinders, a pivotally mounted looper, a pivotally moiuited arm, and a second looper movably carried by said arm, the first mentioned looper being operable by a cam groove in 'one of the cam cylinders and the other looper being operable by correlated cam grooves in the cam cylinders.

t. In a sewing machine, looper mechanism Y erable by the pair of cams.

5. In a sewing machine, looper mechanism `including in combination, a frame cap, supported by and removable from the machine frame, a pair of cams adjacent to said frame cap, an arm pivoted to the frame cap, a looper movably carried by the arm and operable by the pair of cams, and means for securing the frame cap to the machine frame said means being disposed on opposite sides cap, a looper movably carried by the armand operable by the pair of cams, and means for securing the frame cap to the' machine frame, said means being disposed on opposite sides of the looper mechanism supported by saidl cap.

In testimony whereof I aiiX myk signature in the presence of two witnesses.

JOSEPH M. MERROW.

Witnesses:

F. W. SPELLMAN, F. E. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. c. 

